From The Athletic:Ranking all NFL stadiums.

SigFreudianSlip said

Ok glad to see it wasn’t just me about the leg room. I’ve only been to 4 or 5 games over the years as I’m not local…atmosphere is amazing but the leg room was by far the worst of any stadium I’ve been to.

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I would say it's the worst I've been to for any pro sport. The only one I can remember that was comparably bad was Bell Center in Montreal. Even older stadiums/ballparks I've visited like Lambeau, Fenway, and Wrigley have better leg room than the Dome.